I think that depends a lot on the sport and the institutional priorities, which is a factor that gets glossed over sometimes. I’m more familiar with the Ivy League, but I’m guessing NESCAC is similar.
First, the sport matters. As many of you know, wrestling is my background. It is probably the most blue collar sport contested in college. Contrast that with fencing, to use a sport probably on the opposite end of the spectrum, although you could just as easily use golf, tennis, squash or several others. If you are a successful fencer, you probably are in a family that is financially successful and where academics is a big priority.
I picked up several kids from the trailer park to take to wrestling practices or competitions, whose parents hadn’t always graduated HS, or for that matter weren’t always documented. It’s a completely different demographic competing in the sport. Also for many of those kids getting into a NESCAC (or even crappy community college) school can be a life trajectory altering event. I have seen more than one kid who never would have considered college become a successful adult because going to college was the only way they could keep wrestling another 4-5 years.
Point being, if a school wants to even pretend to try to field a competitive team, some sports are going to necessitate lowering the academic standards. Which as I just alluded to can also meet other institutional priorities like getting first generation students and students from underprivileged backgrounds. We are not always but frequently talking about the same kids. I know only 3 NESCAC schools have wrestling, but there is variation among other sports too. That is just the example I am most familiar with, and probably one of the more extreme ones.
The other factor that can make the standards for a particular sport get lowered a bit are institutional priorities. Again falling back on what I know best, Cornell has not finished outside the top 10 teams in D1 wrestling in over a decade and has had numerous national champions. That is because the school has made a decision to prioritize the sport. So they are willing to dip a bit deeper academically to get those athletes that the other Ivies are. I am guessing that Harvard and Yale are willing to dip deeper than Cornell when it comes to recruiting basketball or football players, based on their relative successes in those sports. I don’t know who is prioritizing what, but I’m sure some NESCAC schools are better than others in different sports. If so, there is a good chance that coach is given more flexibility.
This also means that at least at the Ivies, since the average athlete AI has to be within one standard deviation from the student body as a whole, if wrestling or basketball is getting lower AI players, someone has to bring that average back up. So a coach in a sport like fencing or women’s swimming, where there are a lot of really smart kids, knows they have to recruit players substantially above the average AI the school has to meet.
My hunch is that in those higher socioeconomic sports being a competitive player is more akin to a legacy bump. You are getting in over someone else who is equally qualified. But you probably are not getting in over someone who is more qualified. They just don’t have to lower academic standards to field competitive teams in those sports.